A common thread through much of my research is the idea of studying the space of all topological objects of a certain kind, for example, the space of all finite polyhedra, the space of all diffeomorphisms of a manifold, or the space of all knots. Recently I have also been writing a couple of graduate-level textbooks in topology.
Higher simple homotopy theory, Annals of Math. 102 (1975), 101–137.
A proof of the Smale conjecture, Annals of Math. 117 (1983), 553–607.